To avoid impact to my masseter Botox, how long should I wait to get Ulthera?

Botox is injected deeply into the dermal layers in order to affect the masseter muscle. The purpose of this treatment is to relax the muscle, slimming the lower jawline in the process. Ultherapy delivers ultrasound energy into the dermal structure, heating tissue to constrict the layers and promote additional collagen production. The device does not penetrate as deeply as Botox to achieve the desired effect. This means you could safely have your Ulthera treatment within a few days of your Botox injections. Make sure you are working with an experienced, board-certified dermatologist to ensure the best possible outcome from both your treatments. 

You can have Ultherapy within a couple of days after your Botox injection. Botox targets the masseter muscles deep beneath the dermis. It can take up to one month to see the slimming effect. Ultherapy delivers ultrasound energy to the dermal layers and deep fascia to tighten the skin and restore elasticity. The energy produces gentle heating that constricts tissue and boosts collagen production. These two procedures can be very compatible when performed on the jawline. Make sure you are working with a board-certified dermatologist who has the expertise necessary to customize your treatment to your precise needs for an optimal outcome. 

The depth of the Botox treatment for masseter (chewing) muscle enlargement is much deeper than the depth of penetration of Ultherapy energy. Waiting a couple of days should be sufficient to have Ultherapy after Botox if it is injected into the correct depth.If Botox was injected more superficially than the muscle depth, I would wait a week to have Ultherapy after Botox superficial injections. I wait a couple of weeks to inject Botox after ultherapy if the Botox is done afterwards, to allow time for swelling to subside.The information provided in Dr. Shelton's answer is for educational purposes only and is not intended to constitute medical advice.  The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs